My First Set up & my first grow coming soon any tips on my setup ? 12x12x9 Room

I would cover the floor a little better, it looks like you just have plastic over a rug. Get some panda film on the floor too for better reflection. Otherwise, it looks swell.

intake and outake air is big part of the plant needs and some co2 in there will make them like trees and also some waterproff reflective sheeting on the floor i have same sort of set up to you but only do 8 plants but get easy 100oz from 4 weeks in veg

im using a AC unit with Temp control so its AUTO on/off as well a a CO2 GEN with 1500ppm controller im growing 30 plants in buckets 5GAL im using 600watt HPS x4 Sensi A+B GROW sensi A+B Bloom the walls outlined with mlyar and floor is tile if anything i will paint the floor FLAT white no vents needed b/c of AC and co2 controller